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SurfaceTextureRenderer.javaAPI DocAndroid 5.1 API31354Thu Mar 12 22:22:10 GMT 2015android.hardware.camera2.legacy

SurfaceTextureRenderer

public class SurfaceTextureRenderer extends Object
A renderer class that manages the GL state, and can draw a frame into a set of output {@link Surface}s.

Fields Summary
private static final String
TAG
private static final boolean
DEBUG
private static final int
EGL_RECORDABLE_ANDROID
private static final int
GL_MATRIX_SIZE
private static final int
VERTEX_POS_SIZE
private static final int
VERTEX_UV_SIZE
private static final int
EGL_COLOR_BITLENGTH
private static final int
GLES_VERSION
private static final int
PBUFFER_PIXEL_BYTES
private static final int
FLIP_TYPE_NONE
private static final int
FLIP_TYPE_HORIZONTAL
private static final int
FLIP_TYPE_VERTICAL
private static final int
FLIP_TYPE_BOTH
private android.opengl.EGLDisplay
mEGLDisplay
private android.opengl.EGLContext
mEGLContext
private android.opengl.EGLConfig
mConfigs
private List
mSurfaces
private List
mConversionSurfaces
private ByteBuffer
mPBufferPixels
private volatile android.graphics.SurfaceTexture
mSurfaceTexture
private static final int
FLOAT_SIZE_BYTES
private static final int
TRIANGLE_VERTICES_DATA_STRIDE_BYTES
private static final int
TRIANGLE_VERTICES_DATA_POS_OFFSET
private static final int
TRIANGLE_VERTICES_DATA_UV_OFFSET
private static final float[]
sHorizontalFlipTriangleVertices
private static final float[]
sVerticalFlipTriangleVertices
private static final float[]
sBothFlipTriangleVertices
private static final float[]
sRegularTriangleVertices
private FloatBuffer
mRegularTriangleVertices
private FloatBuffer
mHorizontalFlipTriangleVertices
private FloatBuffer
mVerticalFlipTriangleVertices
private FloatBuffer
mBothFlipTriangleVertices
private final int
mFacing
private static final String
VERTEX_SHADER
As used in this file, this vertex shader maps a unit square to the view, and tells the fragment shader to interpolate over it. Each surface pixel position is mapped to a 2D homogeneous texture coordinate of the form (s, t, 0, 1) with s and t in the inclusive range [0, 1], and the matrix from {@link SurfaceTexture#getTransformMatrix(float[])} is used to map this coordinate to a texture location.
private static final String
FRAGMENT_SHADER
This fragment shader simply draws the color in the 2D texture at the location from the {@code VERTEX_SHADER}.
private float[]
mMVPMatrix
private float[]
mSTMatrix
private int
mProgram
private int
mTextureID
private int
muMVPMatrixHandle
private int
muSTMatrixHandle
private int
maPositionHandle
private int
maTextureHandle
private PerfMeasurement
mPerfMeasurer
private static final String
LEGACY_PERF_PROPERTY
Constructors Summary
public SurfaceTextureRenderer(int facing)


       
        mFacing = facing;

        mRegularTriangleVertices = ByteBuffer.allocateDirect(sRegularTriangleVertices.length *
                FLOAT_SIZE_BYTES).order(ByteOrder.nativeOrder()).asFloatBuffer();
        mRegularTriangleVertices.put(sRegularTriangleVertices).position(0);

        mHorizontalFlipTriangleVertices = ByteBuffer.allocateDirect(
                sHorizontalFlipTriangleVertices.length * FLOAT_SIZE_BYTES).
                order(ByteOrder.nativeOrder()).asFloatBuffer();
        mHorizontalFlipTriangleVertices.put(sHorizontalFlipTriangleVertices).position(0);

        mVerticalFlipTriangleVertices = ByteBuffer.allocateDirect(
                sVerticalFlipTriangleVertices.length * FLOAT_SIZE_BYTES).
                order(ByteOrder.nativeOrder()).asFloatBuffer();
        mVerticalFlipTriangleVertices.put(sVerticalFlipTriangleVertices).position(0);

        mBothFlipTriangleVertices = ByteBuffer.allocateDirect(
                sBothFlipTriangleVertices.length * FLOAT_SIZE_BYTES).
                order(ByteOrder.nativeOrder()).asFloatBuffer();
        mBothFlipTriangleVertices.put(sBothFlipTriangleVertices).position(0);

        Matrix.setIdentityM(mSTMatrix, 0);
Methods Summary
private voidaddGlTimestamp(long timestamp)

        if (mPerfMeasurer == null) return;
        mPerfMeasurer.addTimestamp(timestamp);
private voidbeginGlTiming()

        if (mPerfMeasurer == null) return;
        mPerfMeasurer.startTimer();
private voidcheckEglError(java.lang.String msg)

        int error;
        if ((error = EGL14.eglGetError()) != EGL14.EGL_SUCCESS) {
            throw new IllegalStateException(msg + ": EGL error: 0x" + Integer.toHexString(error));
        }
private voidcheckGlError(java.lang.String msg)

        int error;
        while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
            throw new IllegalStateException(msg + ": GLES20 error: 0x" + Integer.toHexString(error));
        }
public voidcleanupEGLContext()
Clean up the current GL context.

        releaseEGLContext();
private voidclearState()

        mSurfaces.clear();
        mConversionSurfaces.clear();
        mPBufferPixels = null;
        if (mSurfaceTexture != null) {
            mSurfaceTexture.release();
        }
        mSurfaceTexture = null;
private voidconfigureEGLContext()

        mEGLDisplay = EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY);
        if (mEGLDisplay == EGL14.EGL_NO_DISPLAY) {
            throw new IllegalStateException("No EGL14 display");
        }
        int[] version = new int[2];
        if (!EGL14.eglInitialize(mEGLDisplay, version, /*offset*/ 0, version, /*offset*/ 1)) {
            throw new IllegalStateException("Cannot initialize EGL14");
        }

        int[] attribList = {
                EGL14.EGL_RED_SIZE, EGL_COLOR_BITLENGTH,
                EGL14.EGL_GREEN_SIZE, EGL_COLOR_BITLENGTH,
                EGL14.EGL_BLUE_SIZE, EGL_COLOR_BITLENGTH,
                EGL14.EGL_RENDERABLE_TYPE, EGL14.EGL_OPENGL_ES2_BIT,
                EGL_RECORDABLE_ANDROID, 1,
                EGL14.EGL_SURFACE_TYPE, EGL14.EGL_PBUFFER_BIT | EGL14.EGL_WINDOW_BIT,
                EGL14.EGL_NONE
        };
        EGLConfig[] configs = new EGLConfig[1];
        int[] numConfigs = new int[1];
        EGL14.eglChooseConfig(mEGLDisplay, attribList, /*offset*/ 0, configs, /*offset*/ 0,
                configs.length, numConfigs, /*offset*/ 0);
        checkEglError("eglCreateContext RGB888+recordable ES2");
        mConfigs = configs[0];
        int[] attrib_list = {
                EGL14.EGL_CONTEXT_CLIENT_VERSION, GLES_VERSION,
                EGL14.EGL_NONE
        };
        mEGLContext = EGL14.eglCreateContext(mEGLDisplay, configs[0], EGL14.EGL_NO_CONTEXT,
                attrib_list, /*offset*/ 0);
        checkEglError("eglCreateContext");
        if(mEGLContext == EGL14.EGL_NO_CONTEXT) {
            throw new IllegalStateException("No EGLContext could be made");
        }
private voidconfigureEGLOutputSurfaces(java.util.Collection surfaces)

        if (surfaces == null || surfaces.size() == 0) {
            throw new IllegalStateException("No Surfaces were provided to draw to");
        }
        int[] surfaceAttribs = {
                EGL14.EGL_NONE
        };
        for (EGLSurfaceHolder holder : surfaces) {
            holder.eglSurface = EGL14.eglCreateWindowSurface(mEGLDisplay, mConfigs,
                    holder.surface, surfaceAttribs, /*offset*/ 0);
            checkEglError("eglCreateWindowSurface");
        }
private voidconfigureEGLPbufferSurfaces(java.util.Collection surfaces)

        if (surfaces == null || surfaces.size() == 0) {
            throw new IllegalStateException("No Surfaces were provided to draw to");
        }

        int maxLength = 0;
        for (EGLSurfaceHolder holder : surfaces) {
            int length = holder.width * holder.height;
            // Find max surface size, ensure PBuffer can hold this many pixels
            maxLength = (length > maxLength) ? length : maxLength;
            int[] surfaceAttribs = {
                    EGL14.EGL_WIDTH, holder.width,
                    EGL14.EGL_HEIGHT, holder.height,
                    EGL14.EGL_NONE
            };
            holder.eglSurface =
                    EGL14.eglCreatePbufferSurface(mEGLDisplay, mConfigs, surfaceAttribs, 0);
            checkEglError("eglCreatePbufferSurface");
        }
        mPBufferPixels = ByteBuffer.allocateDirect(maxLength * PBUFFER_PIXEL_BYTES)
                .order(ByteOrder.nativeOrder());
public voidconfigureSurfaces(java.util.Collection surfaces)
Set a collection of output {@link Surface}s that can be drawn to.

param
surfaces a {@link Collection} of surfaces.

        releaseEGLContext();

        if (surfaces == null || surfaces.size() == 0) {
            Log.w(TAG, "No output surfaces configured for GL drawing.");
            return;
        }

        for (Pair<Surface, Size> p : surfaces) {
            Surface s = p.first;
            Size surfaceSize = p.second;
            // If pixel conversions aren't handled by egl, use a pbuffer
            try {
                EGLSurfaceHolder holder = new EGLSurfaceHolder();
                holder.surface = s;
                holder.width = surfaceSize.getWidth();
                holder.height = surfaceSize.getHeight();
                if (LegacyCameraDevice.needsConversion(s)) {
                    // Always override to YV12 output for YUV surface formats.
                    LegacyCameraDevice.setSurfaceFormat(s, ImageFormat.YV12);
                    mConversionSurfaces.add(holder);
                } else {
                    mSurfaces.add(holder);
                }
            } catch (LegacyExceptionUtils.BufferQueueAbandonedException e) {
                Log.w(TAG, "Surface abandoned, skipping configuration... ", e);
            }
        }

        // Set up egl display
        configureEGLContext();

        // Set up regular egl surfaces if needed
        if (mSurfaces.size() > 0) {
            configureEGLOutputSurfaces(mSurfaces);
        }

        // Set up pbuffer surface if needed
        if (mConversionSurfaces.size() > 0) {
            configureEGLPbufferSurfaces(mConversionSurfaces);
        }
        makeCurrent((mSurfaces.size() > 0) ? mSurfaces.get(0).eglSurface :
                mConversionSurfaces.get(0).eglSurface);
        initializeGLState();
        mSurfaceTexture = new SurfaceTexture(getTextureId());

        // Set up performance tracking if enabled
        if (SystemProperties.getBoolean(LEGACY_PERF_PROPERTY, false)) {
            setupGlTiming();
        }
private intcreateProgram(java.lang.String vertexSource, java.lang.String fragmentSource)

        int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexSource);
        if (vertexShader == 0) {
            return 0;
        }
        int pixelShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentSource);
        if (pixelShader == 0) {
            return 0;
        }

        int program = GLES20.glCreateProgram();
        checkGlError("glCreateProgram");
        if (program == 0) {
            Log.e(TAG, "Could not create program");
        }
        GLES20.glAttachShader(program, vertexShader);
        checkGlError("glAttachShader");
        GLES20.glAttachShader(program, pixelShader);
        checkGlError("glAttachShader");
        GLES20.glLinkProgram(program);
        int[] linkStatus = new int[1];
        GLES20.glGetProgramiv(program, GLES20.GL_LINK_STATUS, linkStatus, 0);
        if (linkStatus[0] != GLES20.GL_TRUE) {
            Log.e(TAG, "Could not link program: ");
            Log.e(TAG, GLES20.glGetProgramInfoLog(program));
            GLES20.glDeleteProgram(program);
            // TODO: handle this more gracefully
            throw new IllegalStateException("Could not link program");
        }
        return program;
private voiddrawFrame(android.graphics.SurfaceTexture st, int width, int height, int flipType)

        checkGlError("onDrawFrame start");
        st.getTransformMatrix(mSTMatrix);

        Matrix.setIdentityM(mMVPMatrix, /*smOffset*/0);

        // Find intermediate buffer dimensions
        Size dimens;
        try {
            dimens = LegacyCameraDevice.getTextureSize(st);
        } catch (LegacyExceptionUtils.BufferQueueAbandonedException e) {
            // Should never hit this.
            throw new IllegalStateException("Surface abandoned, skipping drawFrame...", e);
        }
        float texWidth = dimens.getWidth();
        float texHeight = dimens.getHeight();

        if (texWidth <= 0 || texHeight <= 0) {
            throw new IllegalStateException("Illegal intermediate texture with dimension of 0");
        }

        // Letterbox or pillar-box output dimensions into intermediate dimensions.
        RectF intermediate = new RectF(/*left*/0, /*top*/0, /*right*/texWidth, /*bottom*/texHeight);
        RectF output = new RectF(/*left*/0, /*top*/0, /*right*/width, /*bottom*/height);
        android.graphics.Matrix boxingXform = new android.graphics.Matrix();
        boxingXform.setRectToRect(output, intermediate, android.graphics.Matrix.ScaleToFit.CENTER);
        boxingXform.mapRect(output);

        // Find scaling factor from pillar-boxed/letter-boxed output dimensions to intermediate
        // buffer dimensions.
        float scaleX = intermediate.width() / output.width();
        float scaleY = intermediate.height() / output.height();

        // Intermediate texture is implicitly scaled to 'fill' the output dimensions in clip space
        // coordinates in the shader.  To avoid stretching, we need to scale the larger dimension
        // of the intermediate buffer so that the output buffer is actually letter-boxed
        // or pillar-boxed into the intermediate buffer after clipping.
        Matrix.scaleM(mMVPMatrix, /*offset*/0, /*x*/scaleX, /*y*/scaleY, /*z*/1);

        if (DEBUG) {
            Log.d(TAG, "Scaling factors (S_x = " + scaleX + ",S_y = " + scaleY + ") used for " +
                    width + "x" + height + " surface, intermediate buffer size is " + texWidth +
                    "x" + texHeight);
        }

        // Set viewport to be output buffer dimensions
        GLES20.glViewport(0, 0, width, height);

        if (DEBUG) {
            GLES20.glClearColor(1.0f, 0.0f, 0.0f, 1.0f);
            GLES20.glClear(GLES20.GL_DEPTH_BUFFER_BIT | GLES20.GL_COLOR_BUFFER_BIT);
        }

        GLES20.glUseProgram(mProgram);
        checkGlError("glUseProgram");

        GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
        GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, mTextureID);

        FloatBuffer triangleVertices;
        switch(flipType) {
            case FLIP_TYPE_HORIZONTAL:
                triangleVertices = mHorizontalFlipTriangleVertices;
                break;
            case FLIP_TYPE_VERTICAL:
                triangleVertices = mVerticalFlipTriangleVertices;
                break;
            case FLIP_TYPE_BOTH:
                triangleVertices = mBothFlipTriangleVertices;
                break;
            default:
                triangleVertices = mRegularTriangleVertices;
                break;
        }

        triangleVertices.position(TRIANGLE_VERTICES_DATA_POS_OFFSET);
        GLES20.glVertexAttribPointer(maPositionHandle, VERTEX_POS_SIZE, GLES20.GL_FLOAT,
                /*normalized*/ false, TRIANGLE_VERTICES_DATA_STRIDE_BYTES, triangleVertices);
        checkGlError("glVertexAttribPointer maPosition");
        GLES20.glEnableVertexAttribArray(maPositionHandle);
        checkGlError("glEnableVertexAttribArray maPositionHandle");

        triangleVertices.position(TRIANGLE_VERTICES_DATA_UV_OFFSET);
        GLES20.glVertexAttribPointer(maTextureHandle, VERTEX_UV_SIZE, GLES20.GL_FLOAT,
                /*normalized*/ false, TRIANGLE_VERTICES_DATA_STRIDE_BYTES, triangleVertices);
        checkGlError("glVertexAttribPointer maTextureHandle");
        GLES20.glEnableVertexAttribArray(maTextureHandle);
        checkGlError("glEnableVertexAttribArray maTextureHandle");

        GLES20.glUniformMatrix4fv(muMVPMatrixHandle, /*count*/ 1, /*transpose*/ false, mMVPMatrix,
                /*offset*/ 0);
        GLES20.glUniformMatrix4fv(muSTMatrixHandle, /*count*/ 1, /*transpose*/ false, mSTMatrix,
                /*offset*/ 0);

        GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, /*offset*/ 0, /*count*/ 4);
        checkGlError("glDrawArrays");
public voiddrawIntoSurfaces(CaptureCollector targetCollector)
Draw the current buffer in the {@link SurfaceTexture} returned from {@link #getSurfaceTexture()} into the set of target {@link Surface}s in the next request from the given {@link CaptureCollector}, or drop the frame if none is available.

Any {@link Surface}s targeted must be a subset of the {@link Surface}s set in the last {@link #configureSurfaces(java.util.Collection)} call.

param
targetCollector the surfaces to draw to.

        if ((mSurfaces == null || mSurfaces.size() == 0)
                && (mConversionSurfaces == null || mConversionSurfaces.size() == 0)) {
            return;
        }

        boolean doTiming = targetCollector.hasPendingPreviewCaptures();
        checkGlError("before updateTexImage");

        if (doTiming) {
            beginGlTiming();
        }

        mSurfaceTexture.updateTexImage();

        long timestamp = mSurfaceTexture.getTimestamp();

        Pair<RequestHolder, Long> captureHolder = targetCollector.previewCaptured(timestamp);

        // No preview request queued, drop frame.
        if (captureHolder == null) {
            if (DEBUG) {
                Log.d(TAG, "Dropping preview frame.");
            }
            if (doTiming) {
                endGlTiming();
            }
            return;
        }

        RequestHolder request = captureHolder.first;

        Collection<Surface> targetSurfaces = request.getHolderTargets();
        if (doTiming) {
            addGlTimestamp(timestamp);
        }

        List<Long> targetSurfaceIds = LegacyCameraDevice.getSurfaceIds(targetSurfaces);
        for (EGLSurfaceHolder holder : mSurfaces) {
            if (LegacyCameraDevice.containsSurfaceId(holder.surface, targetSurfaceIds)) {
                try{
                    LegacyCameraDevice.setSurfaceDimens(holder.surface, holder.width,
                            holder.height);
                    makeCurrent(holder.eglSurface);

                    LegacyCameraDevice.setNextTimestamp(holder.surface, captureHolder.second);
                    drawFrame(mSurfaceTexture, holder.width, holder.height,
                            (mFacing == CameraCharacteristics.LENS_FACING_FRONT) ?
                                    FLIP_TYPE_HORIZONTAL : FLIP_TYPE_NONE);
                    swapBuffers(holder.eglSurface);
                } catch (LegacyExceptionUtils.BufferQueueAbandonedException e) {
                    Log.w(TAG, "Surface abandoned, dropping frame. ", e);
                }
            }
        }
        for (EGLSurfaceHolder holder : mConversionSurfaces) {
            if (LegacyCameraDevice.containsSurfaceId(holder.surface, targetSurfaceIds)) {
                makeCurrent(holder.eglSurface);
                // glReadPixels reads from the bottom of the buffer, so add an extra vertical flip
                drawFrame(mSurfaceTexture, holder.width, holder.height,
                        (mFacing == CameraCharacteristics.LENS_FACING_FRONT) ?
                                FLIP_TYPE_BOTH : FLIP_TYPE_VERTICAL);
                mPBufferPixels.clear();
                GLES20.glReadPixels(/*x*/ 0, /*y*/ 0, holder.width, holder.height,
                        GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, mPBufferPixels);
                checkGlError("glReadPixels");

                try {
                    int format = LegacyCameraDevice.detectSurfaceType(holder.surface);
                    LegacyCameraDevice.setSurfaceDimens(holder.surface, holder.width,
                            holder.height);
                    LegacyCameraDevice.setNextTimestamp(holder.surface, captureHolder.second);
                    LegacyCameraDevice.produceFrame(holder.surface, mPBufferPixels.array(),
                            holder.width, holder.height, format);
                } catch (LegacyExceptionUtils.BufferQueueAbandonedException e) {
                    Log.w(TAG, "Surface abandoned, dropping frame. ", e);
                }
            }
        }
        targetCollector.previewProduced();

        if (doTiming) {
            endGlTiming();
        }
private voiddumpGlTiming()
Save a measurement dump to disk, in {@code /sdcard/CameraLegacy/durations_
private voidendGlTiming()

        if (mPerfMeasurer == null) return;
        mPerfMeasurer.stopTimer();
public voidflush()
Drop all current GL operations on the floor.

        // TODO: implement flush
        Log.e(TAG, "Flush not yet implemented.");
public android.graphics.SurfaceTexturegetSurfaceTexture()
Return the surface texture to draw to - this is the texture use to when producing output surface buffers.

return
a {@link SurfaceTexture}.

        return mSurfaceTexture;
private intgetTextureId()

        return mTextureID;
private voidinitializeGLState()
Initializes GL state. Call this after the EGL surface has been created and made current.

        mProgram = createProgram(VERTEX_SHADER, FRAGMENT_SHADER);
        if (mProgram == 0) {
            throw new IllegalStateException("failed creating program");
        }
        maPositionHandle = GLES20.glGetAttribLocation(mProgram, "aPosition");
        checkGlError("glGetAttribLocation aPosition");
        if (maPositionHandle == -1) {
            throw new IllegalStateException("Could not get attrib location for aPosition");
        }
        maTextureHandle = GLES20.glGetAttribLocation(mProgram, "aTextureCoord");
        checkGlError("glGetAttribLocation aTextureCoord");
        if (maTextureHandle == -1) {
            throw new IllegalStateException("Could not get attrib location for aTextureCoord");
        }

        muMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix");
        checkGlError("glGetUniformLocation uMVPMatrix");
        if (muMVPMatrixHandle == -1) {
            throw new IllegalStateException("Could not get attrib location for uMVPMatrix");
        }

        muSTMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uSTMatrix");
        checkGlError("glGetUniformLocation uSTMatrix");
        if (muSTMatrixHandle == -1) {
            throw new IllegalStateException("Could not get attrib location for uSTMatrix");
        }

        int[] textures = new int[1];
        GLES20.glGenTextures(/*n*/ 1, textures, /*offset*/ 0);

        mTextureID = textures[0];
        GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, mTextureID);
        checkGlError("glBindTexture mTextureID");

        GLES20.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MIN_FILTER,
                GLES20.GL_NEAREST);
        GLES20.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MAG_FILTER,
                GLES20.GL_LINEAR);
        GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_S,
                GLES20.GL_CLAMP_TO_EDGE);
        GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_T,
                GLES20.GL_CLAMP_TO_EDGE);
        checkGlError("glTexParameter");
private intloadShader(int shaderType, java.lang.String source)

        int shader = GLES20.glCreateShader(shaderType);
        checkGlError("glCreateShader type=" + shaderType);
        GLES20.glShaderSource(shader, source);
        GLES20.glCompileShader(shader);
        int[] compiled = new int[1];
        GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compiled, 0);
        if (compiled[0] == 0) {
            Log.e(TAG, "Could not compile shader " + shaderType + ":");
            Log.e(TAG, " " + GLES20.glGetShaderInfoLog(shader));
            GLES20.glDeleteShader(shader);
            // TODO: handle this more gracefully
            throw new IllegalStateException("Could not compile shader " + shaderType);
        }
        return shader;
private voidmakeCurrent(android.opengl.EGLSurface surface)

        EGL14.eglMakeCurrent(mEGLDisplay, surface, surface, mEGLContext);
        checkEglError("makeCurrent");
private voidreleaseEGLContext()

        if (mEGLDisplay != EGL14.EGL_NO_DISPLAY) {
            EGL14.eglMakeCurrent(mEGLDisplay, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_SURFACE,
                    EGL14.EGL_NO_CONTEXT);
            dumpGlTiming();
            if (mSurfaces != null) {
                for (EGLSurfaceHolder holder : mSurfaces) {
                    if (holder.eglSurface != null) {
                        EGL14.eglDestroySurface(mEGLDisplay, holder.eglSurface);
                    }
                }
            }
            if (mConversionSurfaces != null) {
                for (EGLSurfaceHolder holder : mConversionSurfaces) {
                    if (holder.eglSurface != null) {
                        EGL14.eglDestroySurface(mEGLDisplay, holder.eglSurface);
                    }
                }
            }
            EGL14.eglDestroyContext(mEGLDisplay, mEGLContext);
            EGL14.eglReleaseThread();
            EGL14.eglTerminate(mEGLDisplay);
        }

        mConfigs = null;
        mEGLDisplay = EGL14.EGL_NO_DISPLAY;
        mEGLContext = EGL14.EGL_NO_CONTEXT;
        clearState();
private voidsetupGlTiming()

        if (PerfMeasurement.isGlTimingSupported()) {
            Log.d(TAG, "Enabling GL performance measurement");
            mPerfMeasurer = new PerfMeasurement();
        } else {
            Log.d(TAG, "GL performance measurement not supported on this device");
            mPerfMeasurer = null;
        }
private booleanswapBuffers(android.opengl.EGLSurface surface)

        boolean result = EGL14.eglSwapBuffers(mEGLDisplay, surface);
        checkEglError("swapBuffers");
        return result;